- Has he tried reinstalling the latest BB OS using a computer? (its carrier specific)
- Sometimes memory cards can cause similar problems.
http://supportforums.blackberry.com/...th/td-p/420846
I am not sure how long ago your friend purchased his phone, or if he has any warranty. If there is a warranty or any sort of support from the carrier, call them/take it to their shop.
http://supportforums.blackberry.com/...TEM/td-p/92398